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US 5,764,686 AGranted
Enhanced time of arrival method
AssigneeSanconix, Inc.
InventorsH. Britton Sanderford, John R. Souvestre
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AssigneeSanconix, Inc.
InventorsH. Britton Sanderford, John R. Souvestre
Estimating the term…
A method for improving a radio location system based on time-of-arrival. Time-of-arrival radio location systems are limited in ultimate accuracy by signal-to-noise ratio and by the time varying multipath environment in which they must operate. The present invention teaches techniques which maintain a high signal-to-noise ratio while identifying a feature of the received signal which is least affected by multipath. The technique uses correlation peak/envelope information to estimate the leading edge of the correlation function, then enhances discrete samples at the leading edge of the correlation function to yield high signal-to-noise ratio readings. The present invention can reduce required transmitted bandwidth, increase system resolution and accuracy by twenty to one, and maintain high message traffic throughput.
A method for improving accuracy of a radio location system based on time-of-arrival using direct sequence spread spectrum to time stamp a signal received as a radio broadcast, the method comprising the steps of:
A method for improving a radio location system based time-of-arrival, using spread spectrum to time stamp a received radio broadcast, the method comprising the steps of:
Dependencies are inferred from the claim text.